Hear Me Roar

Castamere — Whenever a red creature enters the
battlefield under your control, create a colorless
Gold artifact token with "{t}, Sacrifice this
artifact: Add one mana of any color to your
mana pool."
{4}{r}, Sacrifice Hear Me Roar: Return target
Lannister card from your graveyard to your
hand.
A Lannister always pays their debts.